/Engine/Plugins/Interchange/Runtime/Source/Nodes/Public/InterchangeShaderGraphNode.h
Sets the unique id of the material function referenced by the function call expression.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Interchange | Node | Material") bool SetCustomMaterialFunction ( const [FString](API\Runtime\Core\Containers\FString) & AttributeValue )